Probably the most reproduced image of all time.
Taken 7 December, 1972
Apollo 17 mission
Source of high rez imagery:
View of Africa and Saudi Arabia from Apollo 17. Probably the most requested picture of the Earth, this picture was taken by the Apollo 17 astronauts as they left earth orbit en route to the Moon. Taken on Dec. 7, 1972, it was the first time that the trajectory of an Apollo mission enabled a view of the south pole.
Much more on the Blue Marble: